Malicious PDF — malware analysis report

Static analysis result for SHA-256 80d62a0c61bc2aef…

MALICIOUS

PDF

76.7 KB Created: 2021-08-20 04:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a568c737cbe83cbe66364a210f3d948e SHA-1: d3c24e15a29602f601eda91491840b442fb915a0 SHA-256: 80d62a0c61bc2aef3bccac4a43b80c00c450ca93622e89ef61d39299049edf47
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=calidad+productividad+y+competitividad+pdf+gratis
    • http://kondicionery-domodedovo.ru/upload_picture/file/61962373742.pdf
    • https://tinnituskozpont.hu/files/78009683608.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c4716cf1eb5---labutupivuxukeweniwuxurit.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/sogiwirox.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e40549906c---jitalokoxolamozatuvolo.pdf
    • http://zaun-produzent.de/userfiles/file/17856219933.pdf
    • https://tanthuantelecom.com/upload/fck/file/45411682153.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/72999069753.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160992dfaef1d7---xivebawatutidebiwipotiw.pdf
    • https://podereilmontaleo.it/writable/public/userfiles/file/67910106444.pdf
    • https://kristinanamaste.eu/files/49996848984.pdf
    • http://amon-syotengai.com/userfiles/file/52298108759.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6d6c4d5aa---sevesada.pdf
    • http://airfa.it/userfiles/file/vuvofovowafe.pdf
    • http://sswjeans.com/files/52149622610.pdf
    • https://embassyinvietnam.com/webroot/img/files/38981347461.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e2ccedf9---devuzegin.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d77a46de4ea4a0d91b7858a0e7adcead/70224236857.pdf
    • http://pogologistics.com/ckfinder/userfiles/files/vaxifiruxekedakiwexo.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb06d3408---gakiju.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be3f61e5658---71757801052.pdf
    • https://ochronaskory.pl/pliki_user/File/68042192148.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/95dea4294ba61d14ff9e743073a02714/raduzatomib.pdf
    • https://12shio4.com/contents//files/liwepafonudixe.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab80772c6e---52666179384.pdf
    • https://agrilaui.com/userfiles/file/3010362667.pdf
    • https://weyergans-hcc.lv/userfiles/file/88684147218.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c84a.bin
c8349e6babfdaeda5a774f494fb752d78841af840429a3cf2db9c3eb7c8ac8ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC84A 11172 bytes
font_01_sfnt_off0000e250.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 16792 bytes
font_02_sfnt_off0000fa62.bin
8bb206927ebdd1d24a9c3018a1d831f7f2e9b0f6788cf6671338f724faf61514		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 16452 bytes

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